Integral sink



FIG. 1 is a perspective view of my new design for an integral sink;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left end elevation view thereof; and,

FIG. 6 a right end elevation view thereof. 

The ornamental design for an integral sink, as shown and described. 